When doing a scan using FB debugger it mentioned the following issue:
The provided ‘og:image’ properties are not yet available because new images are processed asynchronously. To ensure shares of new URLs include an image, specify the dimensions using ‘og:image:width’ and ‘og:image:height’ tags. Learn More:
Maybe would be a great feature for Smartcrawl if we could add this ‘og:image:width’ and ‘og:image:height’ tags?